Nioxin System Kit 4 (150ml Shampoo 150ml Conditioner 40ml Treatment) is a 3-step professional system including a shampoo, conditioner, and leave-on treatment, clinically designed to target progressed thinning for color-treated or dry, damaged hair. The Scalp Hair Thickening Treatment contains UV protecting ingredients for the scalp and hair. System Kit 4 delivers essential nutrients and antioxidants to the scalp, nourishing and protecting it against damage. Clinically and dermatologically tested, delivering thicker, fuller hair in 30 days.How to use:1. Apply shampoo to scalp and gently massage evenly. Rinse thoroughly.2. Rub conditioner from roots to ends. Rinse thoroughly.3. Apply the treatment to scalp and hair, from roots to ends. Do not rinse.4. Use the complete system at least 3 times/week for visible results.Real Results:- 85% of consumers noticed a thickening effect with our hair thickening products.- 80% noticed an increase in hair density.- 80% noticed an increase in hair fullness.